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I need a spark between two pins with 5mm gap.
And I use this circuit:

enter image description here Things changeable:

  • the characteristics of the transformer (ratio, coil windings, coil gap and ...).

  • The type of the MOSFET.

How to change these in a way that spark can heat the air between two pins up to 363°C? (minimum alcohol combustion temperature)

I think the question is now clear and narrow. and I don't think it still deserves downvotes.

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  • \$\begingroup\$ I am laughing so hard right now. It's a potato gun. I'm much more forgiving to potato gun-makers than I am to mad bombers. \$\endgroup\$
    – user39962
    Commented May 15, 2015 at 8:03
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    \$\begingroup\$ I don't know why you want to do it this way while you can use a simple christmas lamp!!! \$\endgroup\$
    – Roh
    Commented May 15, 2015 at 8:07
  • \$\begingroup\$ Just remove the glass cover and put it in enough explosive charge. \$\endgroup\$
    – Roh
    Commented May 15, 2015 at 8:13
  • \$\begingroup\$ What are you trying to do exactly? What do you mean "crash and be cut into pieces"? How about a "Piezoelectric spark generator"? upload.wikimedia.org/wikipedia/commons/a/ac/Piezo_igniter.jpg \$\endgroup\$
    – Roh
    Commented May 15, 2015 at 8:45
  • \$\begingroup\$ @Roh see the edit. \$\endgroup\$
    – AHB
    Commented Dec 16, 2015 at 15:31

1 Answer 1

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It appears you are attempting to ignite a fuel-air mixture in an enclosed space using an electrical spark. I wonder if there is an existing solution.......

The schematic you made is a classic engine ignition circuit, but as you discovered it takes a fair bit of energy. We want our potato cannon to be portable so a bigger battery isn't practical.

A much simpler solution is a piezo barbecue lighter. Push button -> spark at other end. No batteries required, you can get one for $10 anywhere that sells / services large gas barbecues.

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  • \$\begingroup\$ and just to prove its been done - youtube.com/watch?v=DAyM8Iet1O8 \$\endgroup\$
    – JIm Dearden
    Commented May 15, 2015 at 8:49
  • \$\begingroup\$ What if I don't want an piezo spark generator? \$\endgroup\$
    – AHB
    Commented Dec 16, 2015 at 15:37
  • \$\begingroup\$ Then do it the easy way and use a long lighter like this:dollartree.com/… Just drill a hole in your spud cannon and epoxy the sucker right on in. The lighter even has a trigger, so you can aim the spud and shoot where you want it to go. \$\endgroup\$
    – JRE
    Commented Dec 16, 2015 at 15:44

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